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Post-translational modifications to Toxoplasma gondii alpha- and beta-tubulins include novel C-terminal methylation.


ABSTRACT: Toxoplasma gondii is an apicomplexan of both medical and veterinary importance which is classified as an NIH Category B priority pathogen. It is best known for its ability to cause congenital infection in immune competent hosts and encephalitis in immune compromised hosts. The highly stable and specialized microtubule-based cytoskeleton participates in the invasion process. The genome encodes three isoforms of both alpha- and beta-tubulin and we show that the tubulin is extensively altered by specific post-translational modifications (PTMs) in this paper. T. gondii tubulin PTMs were analyzed by mass spectrometry and immunolabeling using specific antibodies. The PTMs identified on alpha-tubulin included acetylation of Lys40, removal of the last C-terminal amino acid residue Tyr453 (detyrosinated tubulin) and truncation of the last five amino acid residues. Polyglutamylation was detected on both alpha- and beta-tubulins. An antibody directed against mammalian alpha-tubulin lacking the last two C-terminal residues (Delta2-tubulin) labeled the apical region of this parasite. Detyrosinated tubulin was diffusely present in subpellicular microtubules and displayed an apparent accumulation at the basal end. Methylation, a PTM not previously described on tubulin, was also detected. Methylated tubulins were not detected in the host cells, human foreskin fibroblasts, suggesting that this may be a modification specific to the Apicomplexa.

SUBMITTER: Xiao H 

PROVIDER: S-EPMC2813730 | biostudies-literature | 2010 Jan

REPOSITORIES: biostudies-literature

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Post-translational modifications to Toxoplasma gondii alpha- and beta-tubulins include novel C-terminal methylation.

Xiao Hui H   El Bissati Kamal K   Verdier-Pinard Pascal P   Burd Berta B   Zhang Hongshan H   Kim Kami K   Fiser Andras A   Angeletti Ruth Hogue RH   Weiss Louis M LM  

Journal of proteome research 20100101 1


Toxoplasma gondii is an apicomplexan of both medical and veterinary importance which is classified as an NIH Category B priority pathogen. It is best known for its ability to cause congenital infection in immune competent hosts and encephalitis in immune compromised hosts. The highly stable and specialized microtubule-based cytoskeleton participates in the invasion process. The genome encodes three isoforms of both alpha- and beta-tubulin and we show that the tubulin is extensively altered by sp  ...[more]

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